We assemble flat-pack furniture every week — IKEA, Wayfair, Amazon, all of it. Which means we also get called to rescue assemblies every week, and the failures are weirdly predictable. The same seven mistakes, over and over. Avoid these and you'll beat most of the pain:
1. Skipping the inventory count
Every IKEA manual's first page shows the full hardware list. Count it before you start. Discovering you're two cam locks short at step 34 — with a half-built frame blocking the bedroom door — is the classic flat-pack disaster. Five minutes of counting prevents it, and IKEA will mail missing hardware free.
2. Overtightening cam locks
Cam locks (the round metal discs) are quarter-turn fasteners: rotate until snug, stop. Cranking them like a lug nut strips the particleboard socket around them — and stripped particleboard is permanent. There's no re-drilling it like real wood. Snug, not Hulk.
3. Building it right-side-up
Most case furniture (dressers, bookcases, wardrobes) is designed to be built lying flat on the floor, then tipped upright. Building vertically because it 'seems easier' puts racking stress on joints that were never pinned for it, and things crack. Follow the manual's orientation drawings exactly — they're not suggestions.
4. Ignoring the drawer-slide left/right marks
Drawer slides and hinge plates are usually mirrored pairs marked L and R — or distinguishable only by which way a tiny flange points. Mix them up and drawers grind, doors sag, and you'll disassemble half the unit to fix it. When two parts look almost identical, they aren't.
5. Assembling on a hard floor without padding
The #1 cosmetic killer: white laminate edges chip when panels rest on hardwood or tile during assembly. Build on the flattened cardboard box or a rug. Bonus: an uneven floor during assembly can rack the whole frame slightly out of square, and then the doors never line up.
6. Skipping the wall anchor
Not optional. A loaded bookcase or dresser tips with terrifying ease, and tip-over injuries to kids are exactly why every IKEA case piece ships with an anchor strap. The excuse is always plaster walls being hard to anchor into — real, but solvable (see our plaster guide). Anchor it into a stud. Every time. No exceptions in a house with children.
7. Underestimating the big three
PAX wardrobes, kitchen systems, and anything with sliding doors are a different sport: 100+ kg of panels, wall-attachment requirements, and tolerances where 2mm of out-of-square means doors that never glide. These are genuinely two-person, half-day-plus jobs. Know what you're signing up for before you open box one of nine.
About that plaster problem in #6 — if your walls are original plaster (most older homes around Boston), we wrote a full guide to anchoring into plaster walls without cracking them.
The honest DIY math
A BILLY bookcase is a pleasant hour with a podcast — do it yourself. A PAX wardrobe is 4–6 hours, two people, and a real chance of mistake #2, #5, or #7 somewhere in the middle. Professional assembly starts at $79 and includes wall-anchoring on request — a lot of Reading and Melrose families decide their Saturday is worth more than a wardrobe wrestling match. Both answers are correct; just pick one on purpose.
Boxes staring at you from the corner?
We build it right, anchor it safe, and haul the cardboard away. Flat pricing from $79 per item.